A method and decoupler for disengaging an output shaft from an engine in a back drive event with a backdrive decoupler. The backdrive decoupler includes an output shaft, drive shaft wherein the output shaft is selectively coupled to the drive shaft. Permanent magnets are used to transmit torque from the drive shaft to the output shaft. In a backdrive event, the decoupler decouples the output shaft from the drive shaft by uncoupling the torque transfer.

A gas turbine engine, in particular for an airplane, includes a bladed rotor, a shaft driven by a turbine and an electrical generator including first and second generator components that can be rotated and magnetically coupled to one another, the first one being fixed to the shaft and the second one being mechanically coupled to the bladed rotor so as to drive the bladed rotor.

A method and decoupler for disengaging an output shaft from an engine in a back drive event with a backdrive decoupler. The backdrive decoupler includes an output shaft, drive shaft wherein the output shaft is selectively coupled to the drive shaft. Permanent magnets are used to transmit torque from the drive shaft to the output shaft. In a backdrive event, the decoupler decouples the output shaft from the drive shaft by uncoupling the torque transfer.

A turbine arrangement for a turbine may include a turbine wheel and a magnetic coupling having a first rotor and a second rotor, each of which may be rotationally movable about a common axis of rotation defining an axial direction. The first rotor maybe connected to the turbine wheel in a rotationally fixed manner, and may be magnetically coupled with the second rotor in the axial direction. At least one of the first rotor and the second rotor may include a base part, at least one magnetic element, and a holder on an end face of the base part facing the other rotor and in which the magnetic element may be retained. The holder may be designed as a retaining collar projecting axially from the second base part to the other rotor, and into which the magnetic element may be inserted.